Hi!
As can be seen on the testcases, before the -fdirectives-only preprocessing
rewrite the preprocessor would assume // comments are terminated by the
end of file even when newline wasn't there, but now we error out.
The following patch restores the previous behavior.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2021-05-19 Jakub Jelinek <ja...@redhat.com>
PR preprocessor/100646
* lex.c (cpp_directive_only_process): Treat end of file as termination
for !is_block comments.
* gcc.dg/cpp/pr100646-1.c: New test.
* gcc.dg/cpp/pr100646-2.c: New test.
--- libcpp/lex.c.jj 2021-05-12 15:13:57.000000000 +0200
+++ libcpp/lex.c 2021-05-18 19:48:04.211383565 +0200
@@ -4480,6 +4480,8 @@ cpp_directive_only_process (cpp_reader *
break;
}
}
+ if (pos >= limit && !is_block)
+ goto done_comment;
cpp_error_with_line (pfile, CPP_DL_ERROR, sloc, 0,
"unterminated comment");
done_comment:
--- gcc/testsuite/gcc.dg/cpp/pr100646-1.c.jj 2021-05-18 19:54:39.290077340
+0200
+++ gcc/testsuite/gcc.dg/cpp/pr100646-1.c 2021-05-18 19:55:16.139676735
+0200
@@ -0,0 +1,5 @@
+/* PR preprocessor/100646 */
+/* { dg-do compile } */
+/* { dg-options "-fdirectives-only -save-temps -std=c17" } */
+int main () { return 0; }
+// Not newline terminated
\ No newline at end of file
--- gcc/testsuite/gcc.dg/cpp/pr100646-2.c.jj 2021-05-18 20:07:16.079360929
+0200
+++ gcc/testsuite/gcc.dg/cpp/pr100646-2.c 2021-05-18 20:09:56.545550245
+0200
@@ -0,0 +1,6 @@
+/* PR preprocessor/100646 */
+/* { dg-do compile } */
+/* { dg-options "-fdirectives-only -save-temps -std=c17" } */
+int main () { return 0; }
+/* { dg-warning "backslash-newline at end of file" "" { target *-*-* } .+1 } */
+// Not newline terminated\
\ No newline at end of file
Jakub
